Brake adjustment



June 19, 1928.

1,674,313 V. BENDlX BRAKE ADJUSTMENT Filed Aug. 17, 1925 o a s .:=i

INVENTOR VlNgENT BENmX ATTORNEY Patented June 19, 1928.

UNITED STATES PATENT OFFICE.

. VINCENT IBENDIX, OF CHICAGO, ILLINOIS, ABBIGNOR TO BEN DIX BRAKE COMPANY, 01 CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

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Application fled August 17, 1925. Serial No. 50,655.

.This invention relates to brakes, and is illustrated as embodied in an automobile three-shoe brake. An object of the invention is to provide an improved ad ustment 6 for wear, preferably arranged to adjust a pair of friction devices simultaneously. In

one desirable arrangement, manipulation of the anchor of one friction device operates means shifting the anchor of the other, for

example through a reinforcing plate connecting the two anchors.

In the drawin s illustrated as oveifiapping shoes with anchors adjustable inopposite dlrections by shlfting the reinforcing plate. In a three-shoe brake, or other brake in whichone friction device is longer than the other, it is pref erable that the adjustments of the two devices should be at rates proportioned to their lengths,-i. e. in a three-shoe brake the two connected shoes, sustainin more wear than the single reverse shoe, s ould be adjusted at a rate approximately double the rate of ad'ustment of the single shoes.

e above and other objects and features of the invention, includin various novel combinations of parts and esirable particular constructions, will be apparent from the following description of one illustrative em- :0 ,bodiment shown in the accompanying draw- .in in which:

1g. 1 is a vertical sectlon through the brake, just inside the wheel, and showing the shoes in side elevation; and

Fig. 2 is a section on the line 2-2 of Fig.

1, showing the adjustment of the anchors. The illustrated brake includes a drum 10 and a backing plate 12, between which are arranged. a reverse shoe 14, a central shoe 16, and a servo shoe .18. Each of the shoes 14 and 18, which are interchangeable, is forked at its end to provide substantially parallel arms straddling the corresponding end of shoe 16, and the arms of the servo 4.5 shoe 18 are pivotally connected to shoe 16 by a pivot pin 20. The shoes are forced out- "wardly against the drum by a double cam 22 against the resistance of return springs 24 and 26.

The reverse shoe 14 is provided with an anchor 30 passing through an opening 32 in shoe 16, the opening being large enough so that the anchor does not interfere with the movements of shoe 16. Similarly "an the friction devices are anchor 34 for shoe 16 is arranged in relatively large openings 36 in the arms of shoe connect the two anchors.

Anchor 34 has an enlargement 40 e aging the reinforcin plate 38, beyond which s a part 42 exten ing through the reinforcing plate and through an opening 44 in the back ng plate 12, the opening permitting adjustment of the anchor by shifting the reinforcing plate. A nut .46 and washer 48 clamp the parts together to preserve the adjustment so'made. A nut 50 on the other fitting closely in a correspondin openin in the reinforcing plate. It will seen t at turning part 52 of the anchor causes eccentric 58 to shift the reinforcing plate 38 to ad'ust anchor 34.

amp the reinforcmg plate 38, and a. cylindrical eccentric 58 end by which referably anchor 30 is also arranged eccentrically of part 52, its eccentricity being opposlte to that of eccentric 58,- i. e. the

axis of anchor 30 and the axis of eccentric 58 are on opposite sides of the axis of part 52. As the total Wear on shoes 18 and 16 is usually approximately'double the wear on shoe l4, ordinarily the distance between the axis of anchor 30 and the axis of part 52 will be approximately one-half the distance between the axis of part 52 and eccentric 58. Thus turning part 52 will shift the two anchors toward each other to take up for wear, but anchor 34 will be moved approximately twice as farjas anchor 30, the rates of movement being substantially in proportion to the lengths of the two friction devices.

It will also be noted that openin 44 mits adjustment of anchor 34 radia y o the drum in an are about anchor 30 as an axis, by loosening nut 46 and tapping it with the wrench, then tightening it up again to preserve the adjustment.

While one illustrative embodiment has been described in detail, it is not my intention to limit the scope of the invention to that articular embodiment, or otherwise than y the terms of the appended claims.

I claim:

1. A brake having, in combination, a pair of shoes, an anchor for each shoe, and means for adjusting the relative positions of the two anchors including a reinforcing plate shifted lengthwise during the adjustment.

2. A bra e having, in combination, a pair of shoes, an anchor for each shoe, and means for simultaneously adjusting the two anchors including a reinforcing plate for the anchors'which is shifted bodily during the adjustment.

' 3. YA brake having, in combination, friction means, an anchor for their-lotion means, a reinforcing plate in which the anchor is mounted, and means for shifting the reinforcing plate bodily to adjust the anchor.

4. A brake having, in combination, friction means, an anchor for the friction means, a plate in one end of which the an c'hor is mounted, and means enga ing the other end of-the plate for shifting it to adjust the anchor.

5. A brake having, in combination, friction means, an anchor for the ffiction means, a plate carrying the anchor, and. means for shifting the plate bodily lengthwise to adjust the anchor.

6.. A brake having, in combination, a pair of friction devices of difierent lengths, an anchor for each device between the ends of the other device and means g the two anchors and operable to ajust them simultaneously in op osite directions at rates in proportion to t eir length.

7. A brakehaving, in combination, a pair A of friction'devices of diflerent lengths, an anchor for each device, and means Gag ing the two anchors and operable to ai d just them simultaneously in 0p ite directions at rates in roportion to their lengths.

8. A bra e having, in combination, a pair of friction devices of difierent lengths, an anchor for each device, an adjusting device, and means operated by adjustin said device in a given amount to adjustt e aniagiorshglifierently-and in proportion to their ngt 9. A brake having, in combination, a pair of friction devices, one approximately twice as long as the other, an anchor for each device an 'asijusting device, andmeans operatedv by just' said device in a given amount to adjust th anchors and to move one anchor approximately twice as far as emma said position-determining means to take up for wear on'jthe friction devices in proportion to their len hs.

11. A brake aving, in combination, a drum, two friction devices of different lengths, a part for determining the position of each friction device with respect to the drum, and means for adjusting both of said position-determining parts to take up for wear on the friction devices and for moving them diiferently at rates proportioned to the lenghts of the corresponding friction devices.

12. A brake having in combination, a drum, a reverse shoe and apair of connected shoes within the drum, parts for determining the position of the reverse shoe and one end of one of the connected shoes with respect to the drum, and a device for adjusting said parts inopposite directions to takeup for wear and for moving the part engaging the one of the connected shoes approximately twice as far as the part engaging the reverse shoe.

13. A brake having, in combination, a drum, a reverse shoe and a pair of connected shoes within the drum, anchors for the reverse shoe and for one of the connected shoes, and a. device for adjusting said anchors in opposite directions to take up for wear and for moving the anchor of the one of the connected shoes a proximately twice as far as the anchor o the reverse shoe.

14. A brake having, in combination, two shoes, each having an anchor, a reinforcing plate engaging the anchors, and means for shifting the reinforcing plate to adjust the anchors.

15. A brake having, in combination, two shoes, eachhav'mg an anchor, a reinforcing plate engagin the anchors, and means to adjust one an or andto shit the reinforcing plate to adjust the other anchor. v

16. A brake having, in combination, a bacln'ng late having a reinforcing plate, a friction evice having an anchor engaging the reinforcing plate, and means for shifting the reinforcing plate to adjust the anchor relatively to the backing plate.

17. A brake having, in mbination, a backing plate having a reinforcing plate, a friction device having an anchor mounted in and carried by the reinforc' plate, and

means for'shifting the reinforcing late to atlljust the anchor relatively to the aching p ate.

18. A brake having, in combination, a pair of overlapping shoes, an anchor for each shoe atthe overlapped ends, a member connecting the anchors, and means for shifting said member to adjust the anchors.

19. A brake having in combination, a pair of overlapping shoes, an anchor for each shoe at the overlapped ends, a member connecting the anchors, and means rated by manipulation of one anchor for s ifting said member to adjust the other anchor.

20. A brake having, in combination, a pair of overlappin shoes, a connectin member an anchor %or the overlapped end of one shoe carried b said connecting member, and an anchor or the overlapped end of the other shoe having an adjustable eccentric eng 'u said member.

21. A bra e aving, in combination, a pair of overlapping shoes, a connecting member, an anc or for the overlapped end of one shoe carried by said connectm member, an angularly adjustable part aving an eccentric engaging said member, and an anchor for the ot er shoe eccentrically carried by said adjustable part.

22. A brake having, in combination, a

pair of overla ping shoes, a connecting member an anc or for the overlapped end of one shoe carried by said connecting member, and an anchor for the overlapped end of the other shoe having an adjustable eccentric enga ing said member, said eccentric and sai eccentric anchor being offset in opposite directions so that, turning the adjustable part moves the two anchors in opposite directions 23. A brake havin in combination, a drum, shoes engageab e with the drum, an

eigned my name.

anchor for each shoe 'between the ends of the other, one of the anchors being adjustable substantially radially of the drum, and

a member connecting the two anchors and causing the adjustable anchor to swing on an are about the other anchor.

24. A brake having, in combination, a drum, 9. pair of shoes enga cable with the drum, an anchor for each 0 the shoes, one of the anchors being adjustable substantially radially of the drum, and a member connecting the two anchors and causing the adjustable anchor to swing on an are about the other anchor.

25. A brake havin in combination, a drum, shoes enga b e with the drum, an anchor for each s oe between the ends of the other, a plate having a relatively lar e opening for one anchor permitting its a justment, and a member connectingthe two anchors.

26. A brake havin in combination a drum, shoes e ageabfia with the drum, an anchor for shoe between the ends of the other, a plate having a relatively large opening for one anchor rmitting its adjustment, and means to 0 amp the two anchore to the plate.

In testimony whereof I have hereunto VINCENT BENDIX. 

